Before you get super worked up about this, it may be useful to know that this clip is about the "amnesty bill" from 2007, which was strongly supported by President Bush. Also supporting it were Kennedy, McCain, Kyl, and a big mix of Dems and Republicans. It did not however, get enough support to come to a vote.
If you're curious about this bill, more information can be found on the Internets
. It's probably not a great idea to get information on this topic from Lou Dobbs - while he had many admirers when he was on CNN, even his biggest fans will usually admit he was a little rabid about Mexican immigration.